The "few" razors I have seen that have had cell rot all had pitted blades and usually had faux tortoise scales with the pitting on the blade following the pattern of the faux tortoise scales. They also had a vinegary smell to the scales. Not really run into solid colour scales that had cell rot and were gassing off.

IIRC, common advice was to clean them up, put them in a Ziploc bag and store for a bit to see if it returns ad you get that vinegar smell when you open the bag.

Whatever it is it sure is ugly.

Bob